author | jcoomes |
Thu, 16 Feb 2012 13:13:53 -0800 | |
changeset 11758 | b1a0089f89d2 |
parent 10997 | 0be4b3be7197 |
child 12379 | 2cf45b79ce3a |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "gc_implementation/parallelScavenge/adjoiningGenerations.hpp" |
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#include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" |
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#include "gc_implementation/parallelScavenge/cardTableExtension.hpp" |
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#include "gc_implementation/parallelScavenge/gcTaskManager.hpp" |
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#include "gc_implementation/parallelScavenge/generationSizer.hpp" |
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#include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp" |
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#include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" |
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#include "gc_implementation/parallelScavenge/psMarkSweep.hpp" |
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#include "gc_implementation/parallelScavenge/psParallelCompact.hpp" |
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#include "gc_implementation/parallelScavenge/psPromotionManager.hpp" |
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#include "gc_implementation/parallelScavenge/psScavenge.hpp" |
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#include "gc_implementation/parallelScavenge/vmPSOperations.hpp" |
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#include "memory/gcLocker.inline.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/java.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "utilities/vmError.hpp" |
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PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; |
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PSOldGen* ParallelScavengeHeap::_old_gen = NULL; |
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PSPermGen* ParallelScavengeHeap::_perm_gen = NULL; |
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PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; |
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PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; |
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ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; |
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GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; |
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||
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static void trace_gen_sizes(const char* const str, |
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size_t pg_min, size_t pg_max, |
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size_t og_min, size_t og_max, |
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size_t yg_min, size_t yg_max) |
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{ |
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if (TracePageSizes) { |
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tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " |
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SIZE_FORMAT "," SIZE_FORMAT " " |
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SIZE_FORMAT "," SIZE_FORMAT " " |
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SIZE_FORMAT, |
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str, pg_min / K, pg_max / K, |
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og_min / K, og_max / K, |
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yg_min / K, yg_max / K, |
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(pg_max + og_max + yg_max) / K); |
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} |
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} |
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jint ParallelScavengeHeap::initialize() { |
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CollectedHeap::pre_initialize(); |
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// Cannot be initialized until after the flags are parsed |
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// GenerationSizer flag_parser; |
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_collector_policy = new GenerationSizer(); |
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size_t yg_min_size = _collector_policy->min_young_gen_size(); |
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size_t yg_max_size = _collector_policy->max_young_gen_size(); |
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size_t og_min_size = _collector_policy->min_old_gen_size(); |
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size_t og_max_size = _collector_policy->max_old_gen_size(); |
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// Why isn't there a min_perm_gen_size()? |
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size_t pg_min_size = _collector_policy->perm_gen_size(); |
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size_t pg_max_size = _collector_policy->max_perm_gen_size(); |
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trace_gen_sizes("ps heap raw", |
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pg_min_size, pg_max_size, |
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og_min_size, og_max_size, |
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yg_min_size, yg_max_size); |
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// The ReservedSpace ctor used below requires that the page size for the perm |
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// gen is <= the page size for the rest of the heap (young + old gens). |
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const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, |
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yg_max_size + og_max_size, |
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8); |
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const size_t pg_page_sz = MIN2(os::page_size_for_region(pg_min_size, |
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pg_max_size, 16), |
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og_page_sz); |
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const size_t pg_align = set_alignment(_perm_gen_alignment, pg_page_sz); |
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const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); |
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const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); |
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// Update sizes to reflect the selected page size(s). |
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// |
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// NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it |
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// should check UseAdaptiveSizePolicy. Changes from generationSizer could |
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// move to the common code. |
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yg_min_size = align_size_up(yg_min_size, yg_align); |
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yg_max_size = align_size_up(yg_max_size, yg_align); |
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size_t yg_cur_size = |
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align_size_up(_collector_policy->young_gen_size(), yg_align); |
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yg_cur_size = MAX2(yg_cur_size, yg_min_size); |
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og_min_size = align_size_up(og_min_size, og_align); |
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// Align old gen size down to preserve specified heap size. |
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assert(og_align == yg_align, "sanity"); |
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og_max_size = align_size_down(og_max_size, og_align); |
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og_max_size = MAX2(og_max_size, og_min_size); |
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size_t og_cur_size = |
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align_size_down(_collector_policy->old_gen_size(), og_align); |
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og_cur_size = MAX2(og_cur_size, og_min_size); |
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pg_min_size = align_size_up(pg_min_size, pg_align); |
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pg_max_size = align_size_up(pg_max_size, pg_align); |
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size_t pg_cur_size = pg_min_size; |
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trace_gen_sizes("ps heap rnd", |
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pg_min_size, pg_max_size, |
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og_min_size, og_max_size, |
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yg_min_size, yg_max_size); |
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const size_t total_reserved = pg_max_size + og_max_size + yg_max_size; |
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char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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// The main part of the heap (old gen + young gen) can often use a larger page |
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// size than is needed or wanted for the perm gen. Use the "compound |
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// alignment" ReservedSpace ctor to avoid having to use the same page size for |
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// all gens. |
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ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size, |
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og_align, addr); |
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if (UseCompressedOops) { |
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if (addr != NULL && !heap_rs.is_reserved()) { |
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// Failed to reserve at specified address - the requested memory |
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// region is taken already, for example, by 'java' launcher. |
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// Try again to reserver heap higher. |
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addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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ReservedHeapSpace heap_rs0(pg_max_size, pg_align, og_max_size + yg_max_size, |
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og_align, addr); |
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if (addr != NULL && !heap_rs0.is_reserved()) { |
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// Failed to reserve at specified address again - give up. |
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addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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assert(addr == NULL, ""); |
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ReservedHeapSpace heap_rs1(pg_max_size, pg_align, og_max_size + yg_max_size, |
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og_align, addr); |
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heap_rs = heap_rs1; |
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} else { |
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heap_rs = heap_rs0; |
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} |
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} |
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} |
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os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz, |
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heap_rs.base(), pg_max_size); |
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os::trace_page_sizes("ps main", og_min_size + yg_min_size, |
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og_max_size + yg_max_size, og_page_sz, |
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heap_rs.base() + pg_max_size, |
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heap_rs.size() - pg_max_size); |
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if (!heap_rs.is_reserved()) { |
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vm_shutdown_during_initialization( |
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"Could not reserve enough space for object heap"); |
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return JNI_ENOMEM; |
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} |
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_reserved = MemRegion((HeapWord*)heap_rs.base(), |
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(HeapWord*)(heap_rs.base() + heap_rs.size())); |
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CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); |
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_barrier_set = barrier_set; |
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oopDesc::set_bs(_barrier_set); |
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if (_barrier_set == NULL) { |
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vm_shutdown_during_initialization( |
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"Could not reserve enough space for barrier set"); |
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return JNI_ENOMEM; |
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} |
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||
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// Initial young gen size is 4 Mb |
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// |
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190 |
// XXX - what about flag_parser.young_gen_size()? |
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191 |
const size_t init_young_size = align_size_up(4 * M, yg_align); |
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192 |
yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); |
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193 |
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194 |
// Split the reserved space into perm gen and the main heap (everything else). |
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195 |
// The main heap uses a different alignment. |
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ReservedSpace perm_rs = heap_rs.first_part(pg_max_size); |
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ReservedSpace main_rs = heap_rs.last_part(pg_max_size, og_align); |
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199 |
// Make up the generations |
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200 |
// Calculate the maximum size that a generation can grow. This |
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201 |
// includes growth into the other generation. Note that the |
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202 |
// parameter _max_gen_size is kept as the maximum |
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203 |
// size of the generation as the boundaries currently stand. |
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// _max_gen_size is still used as that value. |
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205 |
double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; |
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206 |
double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; |
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207 |
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208 |
_gens = new AdjoiningGenerations(main_rs, |
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og_cur_size, |
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210 |
og_min_size, |
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211 |
og_max_size, |
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212 |
yg_cur_size, |
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213 |
yg_min_size, |
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214 |
yg_max_size, |
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215 |
yg_align); |
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216 |
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217 |
_old_gen = _gens->old_gen(); |
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_young_gen = _gens->young_gen(); |
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219 |
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220 |
const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); |
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221 |
const size_t old_capacity = _old_gen->capacity_in_bytes(); |
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const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); |
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_size_policy = |
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new PSAdaptiveSizePolicy(eden_capacity, |
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initial_promo_size, |
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young_gen()->to_space()->capacity_in_bytes(), |
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intra_heap_alignment(), |
1 | 228 |
max_gc_pause_sec, |
229 |
max_gc_minor_pause_sec, |
|
230 |
GCTimeRatio |
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); |
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232 |
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_perm_gen = new PSPermGen(perm_rs, |
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pg_align, |
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pg_cur_size, |
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pg_cur_size, |
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237 |
pg_max_size, |
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"perm", 2); |
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239 |
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240 |
assert(!UseAdaptiveGCBoundary || |
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241 |
(old_gen()->virtual_space()->high_boundary() == |
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242 |
young_gen()->virtual_space()->low_boundary()), |
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"Boundaries must meet"); |
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244 |
// initialize the policy counters - 2 collectors, 3 generations |
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_gc_policy_counters = |
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new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); |
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_psh = this; |
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// Set up the GCTaskManager |
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250 |
_gc_task_manager = GCTaskManager::create(ParallelGCThreads); |
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252 |
if (UseParallelOldGC && !PSParallelCompact::initialize()) { |
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return JNI_ENOMEM; |
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} |
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return JNI_OK; |
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} |
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void ParallelScavengeHeap::post_initialize() { |
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// Need to init the tenuring threshold |
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261 |
PSScavenge::initialize(); |
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262 |
if (UseParallelOldGC) { |
|
263 |
PSParallelCompact::post_initialize(); |
|
264 |
} else { |
|
265 |
PSMarkSweep::initialize(); |
|
266 |
} |
|
267 |
PSPromotionManager::initialize(); |
|
268 |
} |
|
269 |
||
270 |
void ParallelScavengeHeap::update_counters() { |
|
271 |
young_gen()->update_counters(); |
|
272 |
old_gen()->update_counters(); |
|
273 |
perm_gen()->update_counters(); |
|
274 |
} |
|
275 |
||
276 |
size_t ParallelScavengeHeap::capacity() const { |
|
277 |
size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); |
|
278 |
return value; |
|
279 |
} |
|
280 |
||
281 |
size_t ParallelScavengeHeap::used() const { |
|
282 |
size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); |
|
283 |
return value; |
|
284 |
} |
|
285 |
||
286 |
bool ParallelScavengeHeap::is_maximal_no_gc() const { |
|
287 |
return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); |
|
288 |
} |
|
289 |
||
290 |
||
291 |
size_t ParallelScavengeHeap::permanent_capacity() const { |
|
292 |
return perm_gen()->capacity_in_bytes(); |
|
293 |
} |
|
294 |
||
295 |
size_t ParallelScavengeHeap::permanent_used() const { |
|
296 |
return perm_gen()->used_in_bytes(); |
|
297 |
} |
|
298 |
||
299 |
size_t ParallelScavengeHeap::max_capacity() const { |
|
300 |
size_t estimated = reserved_region().byte_size(); |
|
301 |
estimated -= perm_gen()->reserved().byte_size(); |
|
302 |
if (UseAdaptiveSizePolicy) { |
|
303 |
estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); |
|
304 |
} else { |
|
305 |
estimated -= young_gen()->to_space()->capacity_in_bytes(); |
|
306 |
} |
|
307 |
return MAX2(estimated, capacity()); |
|
308 |
} |
|
309 |
||
310 |
bool ParallelScavengeHeap::is_in(const void* p) const { |
|
311 |
if (young_gen()->is_in(p)) { |
|
312 |
return true; |
|
313 |
} |
|
314 |
||
315 |
if (old_gen()->is_in(p)) { |
|
316 |
return true; |
|
317 |
} |
|
318 |
||
319 |
if (perm_gen()->is_in(p)) { |
|
320 |
return true; |
|
321 |
} |
|
322 |
||
323 |
return false; |
|
324 |
} |
|
325 |
||
326 |
bool ParallelScavengeHeap::is_in_reserved(const void* p) const { |
|
327 |
if (young_gen()->is_in_reserved(p)) { |
|
328 |
return true; |
|
329 |
} |
|
330 |
||
331 |
if (old_gen()->is_in_reserved(p)) { |
|
332 |
return true; |
|
333 |
} |
|
334 |
||
335 |
if (perm_gen()->is_in_reserved(p)) { |
|
336 |
return true; |
|
337 |
} |
|
338 |
||
339 |
return false; |
|
340 |
} |
|
341 |
||
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342 |
bool ParallelScavengeHeap::is_scavengable(const void* addr) { |
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|
343 |
return is_in_young((oop)addr); |
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|
344 |
} |
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|
345 |
|
51267b5e1a3d
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|
346 |
#ifdef ASSERT |
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|
347 |
// Don't implement this by using is_in_young(). This method is used |
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|
348 |
// in some cases to check that is_in_young() is correct. |
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|
349 |
bool ParallelScavengeHeap::is_in_partial_collection(const void *p) { |
51267b5e1a3d
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|
350 |
assert(is_in_reserved(p) || p == NULL, |
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|
351 |
"Does not work if address is non-null and outside of the heap"); |
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|
352 |
// The order of the generations is perm (low addr), old, young (high addr) |
51267b5e1a3d
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|
353 |
return p >= old_gen()->reserved().end(); |
51267b5e1a3d
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diff
changeset
|
354 |
} |
51267b5e1a3d
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diff
changeset
|
355 |
#endif |
51267b5e1a3d
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|
356 |
|
1 | 357 |
// There are two levels of allocation policy here. |
358 |
// |
|
359 |
// When an allocation request fails, the requesting thread must invoke a VM |
|
360 |
// operation, transfer control to the VM thread, and await the results of a |
|
361 |
// garbage collection. That is quite expensive, and we should avoid doing it |
|
362 |
// multiple times if possible. |
|
363 |
// |
|
364 |
// To accomplish this, we have a basic allocation policy, and also a |
|
365 |
// failed allocation policy. |
|
366 |
// |
|
367 |
// The basic allocation policy controls how you allocate memory without |
|
368 |
// attempting garbage collection. It is okay to grab locks and |
|
369 |
// expand the heap, if that can be done without coming to a safepoint. |
|
370 |
// It is likely that the basic allocation policy will not be very |
|
371 |
// aggressive. |
|
372 |
// |
|
373 |
// The failed allocation policy is invoked from the VM thread after |
|
374 |
// the basic allocation policy is unable to satisfy a mem_allocate |
|
375 |
// request. This policy needs to cover the entire range of collection, |
|
376 |
// heap expansion, and out-of-memory conditions. It should make every |
|
377 |
// attempt to allocate the requested memory. |
|
378 |
||
379 |
// Basic allocation policy. Should never be called at a safepoint, or |
|
380 |
// from the VM thread. |
|
381 |
// |
|
382 |
// This method must handle cases where many mem_allocate requests fail |
|
383 |
// simultaneously. When that happens, only one VM operation will succeed, |
|
384 |
// and the rest will not be executed. For that reason, this method loops |
|
385 |
// during failed allocation attempts. If the java heap becomes exhausted, |
|
386 |
// we rely on the size_policy object to force a bail out. |
|
387 |
HeapWord* ParallelScavengeHeap::mem_allocate( |
|
388 |
size_t size, |
|
389 |
bool* gc_overhead_limit_was_exceeded) { |
|
390 |
assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
|
391 |
assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); |
|
392 |
assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
393 |
||
5343
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diff
changeset
|
394 |
// In general gc_overhead_limit_was_exceeded should be false so |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
395 |
// set it so here and reset it to true only if the gc time |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
396 |
// limit is being exceeded as checked below. |
95a5c4b89273
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parents:
4637
diff
changeset
|
397 |
*gc_overhead_limit_was_exceeded = false; |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
398 |
|
9997
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6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
399 |
HeapWord* result = young_gen()->allocate(size); |
1 | 400 |
|
401 |
uint loop_count = 0; |
|
402 |
uint gc_count = 0; |
|
403 |
||
404 |
while (result == NULL) { |
|
405 |
// We don't want to have multiple collections for a single filled generation. |
|
406 |
// To prevent this, each thread tracks the total_collections() value, and if |
|
407 |
// the count has changed, does not do a new collection. |
|
408 |
// |
|
409 |
// The collection count must be read only while holding the heap lock. VM |
|
410 |
// operations also hold the heap lock during collections. There is a lock |
|
411 |
// contention case where thread A blocks waiting on the Heap_lock, while |
|
412 |
// thread B is holding it doing a collection. When thread A gets the lock, |
|
413 |
// the collection count has already changed. To prevent duplicate collections, |
|
414 |
// The policy MUST attempt allocations during the same period it reads the |
|
415 |
// total_collections() value! |
|
416 |
{ |
|
417 |
MutexLocker ml(Heap_lock); |
|
418 |
gc_count = Universe::heap()->total_collections(); |
|
419 |
||
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
420 |
result = young_gen()->allocate(size); |
1 | 421 |
if (result != NULL) { |
422 |
return result; |
|
423 |
} |
|
11758
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
424 |
|
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
425 |
// If certain conditions hold, try allocating from the old gen. |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
426 |
result = mem_allocate_old_gen(size); |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
427 |
if (result != NULL) { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
428 |
return result; |
1 | 429 |
} |
11758
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
430 |
|
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
431 |
// Failed to allocate without a gc. |
1 | 432 |
if (GC_locker::is_active_and_needs_gc()) { |
433 |
// If this thread is not in a jni critical section, we stall |
|
434 |
// the requestor until the critical section has cleared and |
|
435 |
// GC allowed. When the critical section clears, a GC is |
|
436 |
// initiated by the last thread exiting the critical section; so |
|
437 |
// we retry the allocation sequence from the beginning of the loop, |
|
438 |
// rather than causing more, now probably unnecessary, GC attempts. |
|
439 |
JavaThread* jthr = JavaThread::current(); |
|
440 |
if (!jthr->in_critical()) { |
|
441 |
MutexUnlocker mul(Heap_lock); |
|
442 |
GC_locker::stall_until_clear(); |
|
443 |
continue; |
|
444 |
} else { |
|
445 |
if (CheckJNICalls) { |
|
446 |
fatal("Possible deadlock due to allocating while" |
|
447 |
" in jni critical section"); |
|
448 |
} |
|
449 |
return NULL; |
|
450 |
} |
|
451 |
} |
|
452 |
} |
|
453 |
||
454 |
if (result == NULL) { |
|
455 |
// Generate a VM operation |
|
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
456 |
VM_ParallelGCFailedAllocation op(size, gc_count); |
1 | 457 |
VMThread::execute(&op); |
458 |
||
459 |
// Did the VM operation execute? If so, return the result directly. |
|
460 |
// This prevents us from looping until time out on requests that can |
|
461 |
// not be satisfied. |
|
462 |
if (op.prologue_succeeded()) { |
|
463 |
assert(Universe::heap()->is_in_or_null(op.result()), |
|
464 |
"result not in heap"); |
|
465 |
||
466 |
// If GC was locked out during VM operation then retry allocation |
|
467 |
// and/or stall as necessary. |
|
468 |
if (op.gc_locked()) { |
|
469 |
assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
|
470 |
continue; // retry and/or stall as necessary |
|
471 |
} |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
472 |
|
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
473 |
// Exit the loop if the gc time limit has been exceeded. |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
474 |
// The allocation must have failed above ("result" guarding |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
475 |
// this path is NULL) and the most recent collection has exceeded the |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
476 |
// gc overhead limit (although enough may have been collected to |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
477 |
// satisfy the allocation). Exit the loop so that an out-of-memory |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
478 |
// will be thrown (return a NULL ignoring the contents of |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
479 |
// op.result()), |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
480 |
// but clear gc_overhead_limit_exceeded so that the next collection |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
481 |
// starts with a clean slate (i.e., forgets about previous overhead |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
482 |
// excesses). Fill op.result() with a filler object so that the |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
483 |
// heap remains parsable. |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
484 |
const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
485 |
const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
486 |
assert(!limit_exceeded || softrefs_clear, "Should have been cleared"); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
487 |
if (limit_exceeded && softrefs_clear) { |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
488 |
*gc_overhead_limit_was_exceeded = true; |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
489 |
size_policy()->set_gc_overhead_limit_exceeded(false); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
490 |
if (PrintGCDetails && Verbose) { |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
491 |
gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
492 |
"return NULL because gc_overhead_limit_exceeded is set"); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
493 |
} |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
494 |
if (op.result() != NULL) { |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
495 |
CollectedHeap::fill_with_object(op.result(), size); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
496 |
} |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
497 |
return NULL; |
1 | 498 |
} |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
499 |
|
1 | 500 |
return op.result(); |
501 |
} |
|
502 |
} |
|
503 |
||
504 |
// The policy object will prevent us from looping forever. If the |
|
505 |
// time spent in gc crosses a threshold, we will bail out. |
|
506 |
loop_count++; |
|
507 |
if ((result == NULL) && (QueuedAllocationWarningCount > 0) && |
|
508 |
(loop_count % QueuedAllocationWarningCount == 0)) { |
|
509 |
warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" |
|
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
510 |
" size=%d", loop_count, size); |
1 | 511 |
} |
512 |
} |
|
513 |
||
514 |
return result; |
|
515 |
} |
|
516 |
||
11758
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
517 |
// A "death march" is a series of ultra-slow allocations in which a full gc is |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
518 |
// done before each allocation, and after the full gc the allocation still |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
519 |
// cannot be satisfied from the young gen. This routine detects that condition; |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
520 |
// it should be called after a full gc has been done and the allocation |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
521 |
// attempted from the young gen. The parameter 'addr' should be the result of |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
522 |
// that young gen allocation attempt. |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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changeset
|
523 |
void |
b1a0089f89d2
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diff
changeset
|
524 |
ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
525 |
if (addr != NULL) { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
526 |
_death_march_count = 0; // death march has ended |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
527 |
} else if (_death_march_count == 0) { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
528 |
if (should_alloc_in_eden(size)) { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
529 |
_death_march_count = 1; // death march has started |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
530 |
} |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
531 |
} |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
532 |
} |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
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diff
changeset
|
533 |
|
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
534 |
HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
535 |
if (!should_alloc_in_eden(size) || GC_locker::is_active_and_needs_gc()) { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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diff
changeset
|
536 |
// Size is too big for eden, or gc is locked out. |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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diff
changeset
|
537 |
return old_gen()->allocate(size); |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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diff
changeset
|
538 |
} |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
539 |
|
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
540 |
// If a "death march" is in progress, allocate from the old gen a limited |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
541 |
// number of times before doing a GC. |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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diff
changeset
|
542 |
if (_death_march_count > 0) { |
b1a0089f89d2
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parents:
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diff
changeset
|
543 |
if (_death_march_count < 64) { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
544 |
++_death_march_count; |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
545 |
return old_gen()->allocate(size); |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
546 |
} else { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
547 |
_death_march_count = 0; |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
548 |
} |
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6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
549 |
} |
b1a0089f89d2
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diff
changeset
|
550 |
return NULL; |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
551 |
} |
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parents:
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changeset
|
552 |
|
1 | 553 |
// Failed allocation policy. Must be called from the VM thread, and |
554 |
// only at a safepoint! Note that this method has policy for allocation |
|
555 |
// flow, and NOT collection policy. So we do not check for gc collection |
|
556 |
// time over limit here, that is the responsibility of the heap specific |
|
557 |
// collection methods. This method decides where to attempt allocations, |
|
558 |
// and when to attempt collections, but no collection specific policy. |
|
9997
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6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
559 |
HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) { |
1 | 560 |
assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
561 |
assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); |
|
562 |
assert(!Universe::heap()->is_gc_active(), "not reentrant"); |
|
563 |
assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
564 |
||
11758
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
565 |
// We assume that allocation in eden will fail unless we collect. |
1 | 566 |
|
567 |
// First level allocation failure, scavenge and allocate in young gen. |
|
568 |
GCCauseSetter gccs(this, GCCause::_allocation_failure); |
|
11758
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
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diff
changeset
|
569 |
const bool invoked_full_gc = PSScavenge::invoke(); |
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
570 |
HeapWord* result = young_gen()->allocate(size); |
1 | 571 |
|
572 |
// Second level allocation failure. |
|
573 |
// Mark sweep and allocate in young generation. |
|
11758
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
574 |
if (result == NULL && !invoked_full_gc) { |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
10997
diff
changeset
|
575 |
invoke_full_gc(false); |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
10997
diff
changeset
|
576 |
result = young_gen()->allocate(size); |
1 | 577 |
} |
578 |
||
11758
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
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parents:
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diff
changeset
|
579 |
death_march_check(result, size); |
b1a0089f89d2
6330863: vm/gc/InfiniteList.java fails intermittently due to timeout
jcoomes
parents:
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diff
changeset
|
580 |
|
1 | 581 |
// Third level allocation failure. |
582 |
// After mark sweep and young generation allocation failure, |
|
583 |
// allocate in old generation. |
|
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
584 |
if (result == NULL) { |
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
585 |
result = old_gen()->allocate(size); |
1 | 586 |
} |
587 |
||
588 |
// Fourth level allocation failure. We're running out of memory. |
|
589 |
// More complete mark sweep and allocate in young generation. |
|
590 |
if (result == NULL) { |
|
591 |
invoke_full_gc(true); |
|
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
592 |
result = young_gen()->allocate(size); |
1 | 593 |
} |
594 |
||
595 |
// Fifth level allocation failure. |
|
596 |
// After more complete mark sweep, allocate in old generation. |
|
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
597 |
if (result == NULL) { |
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
598 |
result = old_gen()->allocate(size); |
1 | 599 |
} |
600 |
||
601 |
return result; |
|
602 |
} |
|
603 |
||
604 |
// |
|
605 |
// This is the policy loop for allocating in the permanent generation. |
|
606 |
// If the initial allocation fails, we create a vm operation which will |
|
607 |
// cause a collection. |
|
608 |
HeapWord* ParallelScavengeHeap::permanent_mem_allocate(size_t size) { |
|
609 |
assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
|
610 |
assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); |
|
611 |
assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
612 |
||
613 |
HeapWord* result; |
|
614 |
||
615 |
uint loop_count = 0; |
|
616 |
uint gc_count = 0; |
|
617 |
uint full_gc_count = 0; |
|
618 |
||
619 |
do { |
|
620 |
// We don't want to have multiple collections for a single filled generation. |
|
621 |
// To prevent this, each thread tracks the total_collections() value, and if |
|
622 |
// the count has changed, does not do a new collection. |
|
623 |
// |
|
624 |
// The collection count must be read only while holding the heap lock. VM |
|
625 |
// operations also hold the heap lock during collections. There is a lock |
|
626 |
// contention case where thread A blocks waiting on the Heap_lock, while |
|
627 |
// thread B is holding it doing a collection. When thread A gets the lock, |
|
628 |
// the collection count has already changed. To prevent duplicate collections, |
|
629 |
// The policy MUST attempt allocations during the same period it reads the |
|
630 |
// total_collections() value! |
|
631 |
{ |
|
632 |
MutexLocker ml(Heap_lock); |
|
633 |
gc_count = Universe::heap()->total_collections(); |
|
634 |
full_gc_count = Universe::heap()->total_full_collections(); |
|
635 |
||
636 |
result = perm_gen()->allocate_permanent(size); |
|
386
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
637 |
|
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
638 |
if (result != NULL) { |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
639 |
return result; |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
640 |
} |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
641 |
|
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
642 |
if (GC_locker::is_active_and_needs_gc()) { |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
643 |
// If this thread is not in a jni critical section, we stall |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
644 |
// the requestor until the critical section has cleared and |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
645 |
// GC allowed. When the critical section clears, a GC is |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
646 |
// initiated by the last thread exiting the critical section; so |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
647 |
// we retry the allocation sequence from the beginning of the loop, |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
648 |
// rather than causing more, now probably unnecessary, GC attempts. |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
649 |
JavaThread* jthr = JavaThread::current(); |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
650 |
if (!jthr->in_critical()) { |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
651 |
MutexUnlocker mul(Heap_lock); |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
652 |
GC_locker::stall_until_clear(); |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
653 |
continue; |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
654 |
} else { |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
655 |
if (CheckJNICalls) { |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
656 |
fatal("Possible deadlock due to allocating while" |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
657 |
" in jni critical section"); |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
658 |
} |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
659 |
return NULL; |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
660 |
} |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
661 |
} |
1 | 662 |
} |
663 |
||
664 |
if (result == NULL) { |
|
665 |
||
666 |
// Exit the loop if the gc time limit has been exceeded. |
|
667 |
// The allocation must have failed above (result must be NULL), |
|
668 |
// and the most recent collection must have exceeded the |
|
669 |
// gc time limit. Exit the loop so that an out-of-memory |
|
670 |
// will be thrown (returning a NULL will do that), but |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
671 |
// clear gc_overhead_limit_exceeded so that the next collection |
1 | 672 |
// will succeeded if the applications decides to handle the |
673 |
// out-of-memory and tries to go on. |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
674 |
const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
675 |
if (limit_exceeded) { |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
676 |
size_policy()->set_gc_overhead_limit_exceeded(false); |
1 | 677 |
if (PrintGCDetails && Verbose) { |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
678 |
gclog_or_tty->print_cr("ParallelScavengeHeap::permanent_mem_allocate:" |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
679 |
" return NULL because gc_overhead_limit_exceeded is set"); |
1 | 680 |
} |
681 |
assert(result == NULL, "Allocation did not fail"); |
|
682 |
return NULL; |
|
683 |
} |
|
684 |
||
685 |
// Generate a VM operation |
|
686 |
VM_ParallelGCFailedPermanentAllocation op(size, gc_count, full_gc_count); |
|
687 |
VMThread::execute(&op); |
|
688 |
||
689 |
// Did the VM operation execute? If so, return the result directly. |
|
690 |
// This prevents us from looping until time out on requests that can |
|
691 |
// not be satisfied. |
|
692 |
if (op.prologue_succeeded()) { |
|
693 |
assert(Universe::heap()->is_in_permanent_or_null(op.result()), |
|
694 |
"result not in heap"); |
|
386
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
695 |
// If GC was locked out during VM operation then retry allocation |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
696 |
// and/or stall as necessary. |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
697 |
if (op.gc_locked()) { |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
698 |
assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
699 |
continue; // retry and/or stall as necessary |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
186
diff
changeset
|
700 |
} |
1 | 701 |
// If a NULL results is being returned, an out-of-memory |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
702 |
// will be thrown now. Clear the gc_overhead_limit_exceeded |
1 | 703 |
// flag to avoid the following situation. |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
704 |
// gc_overhead_limit_exceeded is set during a collection |
1 | 705 |
// the collection fails to return enough space and an OOM is thrown |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
706 |
// a subsequent GC prematurely throws an out-of-memory because |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
707 |
// the gc_overhead_limit_exceeded counts did not start |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
708 |
// again from 0. |
1 | 709 |
if (op.result() == NULL) { |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4637
diff
changeset
|
710 |
size_policy()->reset_gc_overhead_limit_count(); |
1 | 711 |
} |
712 |
return op.result(); |
|
713 |
} |
|
714 |
} |
|
715 |
||
716 |
// The policy object will prevent us from looping forever. If the |
|
717 |
// time spent in gc crosses a threshold, we will bail out. |
|
718 |
loop_count++; |
|
719 |
if ((QueuedAllocationWarningCount > 0) && |
|
720 |
(loop_count % QueuedAllocationWarningCount == 0)) { |
|
721 |
warning("ParallelScavengeHeap::permanent_mem_allocate retries %d times \n\t" |
|
722 |
" size=%d", loop_count, size); |
|
723 |
} |
|
724 |
} while (result == NULL); |
|
725 |
||
726 |
return result; |
|
727 |
} |
|
728 |
||
729 |
// |
|
730 |
// This is the policy code for permanent allocations which have failed |
|
731 |
// and require a collection. Note that just as in failed_mem_allocate, |
|
732 |
// we do not set collection policy, only where & when to allocate and |
|
733 |
// collect. |
|
734 |
HeapWord* ParallelScavengeHeap::failed_permanent_mem_allocate(size_t size) { |
|
735 |
assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
|
736 |
assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); |
|
737 |
assert(!Universe::heap()->is_gc_active(), "not reentrant"); |
|
738 |
assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
739 |
assert(size > perm_gen()->free_in_words(), "Allocation should fail"); |
|
740 |
||
741 |
// We assume (and assert!) that an allocation at this point will fail |
|
742 |
// unless we collect. |
|
743 |
||
744 |
// First level allocation failure. Mark-sweep and allocate in perm gen. |
|
745 |
GCCauseSetter gccs(this, GCCause::_allocation_failure); |
|
746 |
invoke_full_gc(false); |
|
747 |
HeapWord* result = perm_gen()->allocate_permanent(size); |
|
748 |
||
749 |
// Second level allocation failure. We're running out of memory. |
|
750 |
if (result == NULL) { |
|
751 |
invoke_full_gc(true); |
|
752 |
result = perm_gen()->allocate_permanent(size); |
|
753 |
} |
|
754 |
||
755 |
return result; |
|
756 |
} |
|
757 |
||
758 |
void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { |
|
759 |
CollectedHeap::ensure_parsability(retire_tlabs); |
|
760 |
young_gen()->eden_space()->ensure_parsability(); |
|
761 |
} |
|
762 |
||
763 |
size_t ParallelScavengeHeap::unsafe_max_alloc() { |
|
764 |
return young_gen()->eden_space()->free_in_bytes(); |
|
765 |
} |
|
766 |
||
767 |
size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { |
|
768 |
return young_gen()->eden_space()->tlab_capacity(thr); |
|
769 |
} |
|
770 |
||
771 |
size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
|
772 |
return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); |
|
773 |
} |
|
774 |
||
775 |
HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { |
|
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
776 |
return young_gen()->allocate(size); |
1 | 777 |
} |
778 |
||
779 |
void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { |
|
780 |
CollectedHeap::accumulate_statistics_all_tlabs(); |
|
781 |
} |
|
782 |
||
783 |
void ParallelScavengeHeap::resize_all_tlabs() { |
|
784 |
CollectedHeap::resize_all_tlabs(); |
|
785 |
} |
|
786 |
||
4030
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3908
diff
changeset
|
787 |
bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3908
diff
changeset
|
788 |
// We don't need barriers for stores to objects in the |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3908
diff
changeset
|
789 |
// young gen and, a fortiori, for initializing stores to |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3908
diff
changeset
|
790 |
// objects therein. |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3908
diff
changeset
|
791 |
return is_in_young(new_obj); |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3908
diff
changeset
|
792 |
} |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3908
diff
changeset
|
793 |
|
1 | 794 |
// This method is used by System.gc() and JVMTI. |
795 |
void ParallelScavengeHeap::collect(GCCause::Cause cause) { |
|
796 |
assert(!Heap_lock->owned_by_self(), |
|
797 |
"this thread should not own the Heap_lock"); |
|
798 |
||
799 |
unsigned int gc_count = 0; |
|
800 |
unsigned int full_gc_count = 0; |
|
801 |
{ |
|
802 |
MutexLocker ml(Heap_lock); |
|
803 |
// This value is guarded by the Heap_lock |
|
804 |
gc_count = Universe::heap()->total_collections(); |
|
805 |
full_gc_count = Universe::heap()->total_full_collections(); |
|
806 |
} |
|
807 |
||
808 |
VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); |
|
809 |
VMThread::execute(&op); |
|
810 |
} |
|
811 |
||
812 |
// This interface assumes that it's being called by the |
|
813 |
// vm thread. It collects the heap assuming that the |
|
814 |
// heap lock is already held and that we are executing in |
|
815 |
// the context of the vm thread. |
|
816 |
void ParallelScavengeHeap::collect_as_vm_thread(GCCause::Cause cause) { |
|
817 |
assert(Thread::current()->is_VM_thread(), "Precondition#1"); |
|
818 |
assert(Heap_lock->is_locked(), "Precondition#2"); |
|
819 |
GCCauseSetter gcs(this, cause); |
|
820 |
switch (cause) { |
|
821 |
case GCCause::_heap_inspection: |
|
822 |
case GCCause::_heap_dump: { |
|
823 |
HandleMark hm; |
|
824 |
invoke_full_gc(false); |
|
825 |
break; |
|
826 |
} |
|
827 |
default: // XXX FIX ME |
|
828 |
ShouldNotReachHere(); |
|
829 |
} |
|
830 |
} |
|
831 |
||
832 |
||
833 |
void ParallelScavengeHeap::oop_iterate(OopClosure* cl) { |
|
834 |
Unimplemented(); |
|
835 |
} |
|
836 |
||
837 |
void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { |
|
838 |
young_gen()->object_iterate(cl); |
|
839 |
old_gen()->object_iterate(cl); |
|
840 |
perm_gen()->object_iterate(cl); |
|
841 |
} |
|
842 |
||
843 |
void ParallelScavengeHeap::permanent_oop_iterate(OopClosure* cl) { |
|
844 |
Unimplemented(); |
|
845 |
} |
|
846 |
||
847 |
void ParallelScavengeHeap::permanent_object_iterate(ObjectClosure* cl) { |
|
848 |
perm_gen()->object_iterate(cl); |
|
849 |
} |
|
850 |
||
851 |
HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { |
|
852 |
if (young_gen()->is_in_reserved(addr)) { |
|
853 |
assert(young_gen()->is_in(addr), |
|
854 |
"addr should be in allocated part of young gen"); |
|
7108 | 855 |
// called from os::print_location by find or VMError |
856 |
if (Debugging || VMError::fatal_error_in_progress()) return NULL; |
|
1 | 857 |
Unimplemented(); |
858 |
} else if (old_gen()->is_in_reserved(addr)) { |
|
859 |
assert(old_gen()->is_in(addr), |
|
860 |
"addr should be in allocated part of old gen"); |
|
861 |
return old_gen()->start_array()->object_start((HeapWord*)addr); |
|
862 |
} else if (perm_gen()->is_in_reserved(addr)) { |
|
863 |
assert(perm_gen()->is_in(addr), |
|
864 |
"addr should be in allocated part of perm gen"); |
|
865 |
return perm_gen()->start_array()->object_start((HeapWord*)addr); |
|
866 |
} |
|
867 |
return 0; |
|
868 |
} |
|
869 |
||
870 |
size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { |
|
871 |
return oop(addr)->size(); |
|
872 |
} |
|
873 |
||
874 |
bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { |
|
875 |
return block_start(addr) == addr; |
|
876 |
} |
|
877 |
||
878 |
jlong ParallelScavengeHeap::millis_since_last_gc() { |
|
879 |
return UseParallelOldGC ? |
|
880 |
PSParallelCompact::millis_since_last_gc() : |
|
881 |
PSMarkSweep::millis_since_last_gc(); |
|
882 |
} |
|
883 |
||
884 |
void ParallelScavengeHeap::prepare_for_verify() { |
|
885 |
ensure_parsability(false); // no need to retire TLABs for verification |
|
886 |
} |
|
887 |
||
888 |
void ParallelScavengeHeap::print_on(outputStream* st) const { |
|
889 |
young_gen()->print_on(st); |
|
890 |
old_gen()->print_on(st); |
|
891 |
perm_gen()->print_on(st); |
|
892 |
} |
|
893 |
||
894 |
void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { |
|
895 |
PSScavenge::gc_task_manager()->threads_do(tc); |
|
896 |
} |
|
897 |
||
898 |
void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { |
|
899 |
PSScavenge::gc_task_manager()->print_threads_on(st); |
|
900 |
} |
|
901 |
||
902 |
void ParallelScavengeHeap::print_tracing_info() const { |
|
903 |
if (TraceGen0Time) { |
|
904 |
double time = PSScavenge::accumulated_time()->seconds(); |
|
905 |
tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); |
|
906 |
} |
|
907 |
if (TraceGen1Time) { |
|
908 |
double time = PSMarkSweep::accumulated_time()->seconds(); |
|
909 |
tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); |
|
910 |
} |
|
911 |
} |
|
912 |
||
913 |
||
9995
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9935
diff
changeset
|
914 |
void ParallelScavengeHeap::verify(bool allow_dirty, bool silent, VerifyOption option /* ignored */) { |
1 | 915 |
// Why do we need the total_collections()-filter below? |
916 |
if (total_collections() > 0) { |
|
917 |
if (!silent) { |
|
918 |
gclog_or_tty->print("permanent "); |
|
919 |
} |
|
920 |
perm_gen()->verify(allow_dirty); |
|
921 |
||
922 |
if (!silent) { |
|
923 |
gclog_or_tty->print("tenured "); |
|
924 |
} |
|
925 |
old_gen()->verify(allow_dirty); |
|
926 |
||
927 |
if (!silent) { |
|
928 |
gclog_or_tty->print("eden "); |
|
929 |
} |
|
930 |
young_gen()->verify(allow_dirty); |
|
931 |
} |
|
932 |
} |
|
933 |
||
934 |
void ParallelScavengeHeap::print_heap_change(size_t prev_used) { |
|
935 |
if (PrintGCDetails && Verbose) { |
|
936 |
gclog_or_tty->print(" " SIZE_FORMAT |
|
937 |
"->" SIZE_FORMAT |
|
938 |
"(" SIZE_FORMAT ")", |
|
939 |
prev_used, used(), capacity()); |
|
940 |
} else { |
|
941 |
gclog_or_tty->print(" " SIZE_FORMAT "K" |
|
942 |
"->" SIZE_FORMAT "K" |
|
943 |
"(" SIZE_FORMAT "K)", |
|
944 |
prev_used / K, used() / K, capacity() / K); |
|
945 |
} |
|
946 |
} |
|
947 |
||
948 |
ParallelScavengeHeap* ParallelScavengeHeap::heap() { |
|
949 |
assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); |
|
950 |
assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); |
|
951 |
return _psh; |
|
952 |
} |
|
953 |
||
954 |
// Before delegating the resize to the young generation, |
|
955 |
// the reserved space for the young and old generations |
|
956 |
// may be changed to accomodate the desired resize. |
|
957 |
void ParallelScavengeHeap::resize_young_gen(size_t eden_size, |
|
958 |
size_t survivor_size) { |
|
959 |
if (UseAdaptiveGCBoundary) { |
|
960 |
if (size_policy()->bytes_absorbed_from_eden() != 0) { |
|
961 |
size_policy()->reset_bytes_absorbed_from_eden(); |
|
962 |
return; // The generation changed size already. |
|
963 |
} |
|
964 |
gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); |
|
965 |
} |
|
966 |
||
967 |
// Delegate the resize to the generation. |
|
968 |
_young_gen->resize(eden_size, survivor_size); |
|
969 |
} |
|
970 |
||
971 |
// Before delegating the resize to the old generation, |
|
972 |
// the reserved space for the young and old generations |
|
973 |
// may be changed to accomodate the desired resize. |
|
974 |
void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { |
|
975 |
if (UseAdaptiveGCBoundary) { |
|
976 |
if (size_policy()->bytes_absorbed_from_eden() != 0) { |
|
977 |
size_policy()->reset_bytes_absorbed_from_eden(); |
|
978 |
return; // The generation changed size already. |
|
979 |
} |
|
980 |
gens()->adjust_boundary_for_old_gen_needs(desired_free_space); |
|
981 |
} |
|
982 |
||
983 |
// Delegate the resize to the generation. |
|
984 |
_old_gen->resize(desired_free_space); |
|
985 |
} |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
986 |
|
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
3262
diff
changeset
|
987 |
ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
3262
diff
changeset
|
988 |
// nothing particular |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
3262
diff
changeset
|
989 |
} |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
3262
diff
changeset
|
990 |
|
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
3262
diff
changeset
|
991 |
ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
3262
diff
changeset
|
992 |
// nothing particular |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
3262
diff
changeset
|
993 |
} |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
3262
diff
changeset
|
994 |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
995 |
#ifndef PRODUCT |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
996 |
void ParallelScavengeHeap::record_gen_tops_before_GC() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
997 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
998 |
young_gen()->record_spaces_top(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
999 |
old_gen()->record_spaces_top(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1000 |
perm_gen()->record_spaces_top(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1001 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1002 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1003 |
|
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1004 |
void ParallelScavengeHeap::gen_mangle_unused_area() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1005 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1006 |
young_gen()->eden_space()->mangle_unused_area(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1007 |
young_gen()->to_space()->mangle_unused_area(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1008 |
young_gen()->from_space()->mangle_unused_area(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1009 |
old_gen()->object_space()->mangle_unused_area(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1010 |
perm_gen()->object_space()->mangle_unused_area(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1011 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1012 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
386
diff
changeset
|
1013 |
#endif |